Modern Vespa

Next week, I'm getting a GTS 300 Super (2016) after being t-boned by a car earlier this month.
I had a lovely top box on my now written-off GTS 125 Super but I don't know if it was 36 or 42 liter!
Any thoughts on which size is best suited to the GTS, which is standard / recommended/ default choice or which one simply looks better?
Thanks

I am in the same mode right now for my 2017 GTS - that being said what is your budget? From looking at storage options it comes down to cost.

I will be test fitting motorcycle side bags (image below).

Top boxes can get quite expensive unless you get creative.

42l is the right one.

I love my GIVI e450 (45L) top case. There's even a light kit that ties into the brake and turn signals. I've had the same one for 5 or 6 years...3 or 4 on the GTS and 2 so far on the Triumph.
Small enough to not look awkward or affect handling (with bar end weight upgrade); big enough to hold a full bag of groceries, a couple of soda 12-packs, or whatever else I've thrown at it.

I suppose part of the answer depends on how much space you really need in a topcase. I would guess that most of us have the OEM 36 lt topcase. It is a likely choice as it is readily available in matching colors and matching backpad. I have found the 36 lt. case adequate for my needs, and it is probably not a good idea to overload the weight on the rear rack.

Thanks Dooglas & JIMC, so is OEM is 36L? Do you know if they are visually much different eg does the 36Litre one look in better proportion than the 42L or is it highly subjective / either of them look good? I'm more concerned with the look of the case on the scooter than its ultimate carrying capability.
I assume they are both the exact same shape?
Would anyone be able to say if this (from my GTS125, now written off) is 36 or 42L?

It looks like the 36 LT box to me.

Curious as to how you are going to mount the side cases !!!

test run with actual dimensions/proportions:
green dot - body mount points
purple dot - upper frame and lower frame meet point not attached to body of scoot
red dash - frame to main support under seat (existing grab bar hole)
blue dash - frame to body mount side panel mounting hole (tbd)

my scoot is red so black bags might look ok I think

when it gets warm outside time to bust out the welder...

That could easily be a 42l case - looks just like ours (both 42l). BUT if the 36 is a very similar shape, I could very well be wrong.

on that lower mount, you might be able to get into the body underneath the fairing (depending on spacing-- for what's behind it, and size of fastener) the result would be super clean if you had them off and not gaping holes in the body. I did a similar set on an ET years and years ago and it worked out a treat.

looking into this as we speak - will need to mock it up in IRL but so far I like the balance I'm gettin...higher mount is easier but lower has a bagger look to it...tbc (wait till I mock up what I got for the front LOL)

I love top boxes but try and stay under 40 liters. No real reason why but I think it has something to do with looking weird past 40 liters. But I would let a nice, color matched 42 liter slip by. Keyed alike would be a bonus!

Actually the 36 and 42 liter Vespa topcases do look very similar. There is a small difference in the slope of the back portion of the lid, but it isn't striking. Perhaps more to the point, look at ScooterWest (Motosport) or SIP online. You will find a large selection of 36 liter cases in most colors and very few 42 liter cases

I have a GIVI 47L monolock topcase on my Liberty s150. Off the scoot, to my eye the case looks enormous, but installed, it seems A-OK. Plus, since the Liberty is my go-to scoot for rides to work, the grocery store, etc., I really appreciate the extra space.

My Vespa GTV, however, absolutely MUST look all matchy-matchy with the OEM topcase and seat-matched backrest. Nothing else will do.

CNVH Can you share pics of how it looks? I have the 30 L on mine but sometimes wonder about going bigger. Also is it ever annoying having something inside slide around or spill because the case is too big?

I settled for the 36L in the end - and I think it looks most in proportion on the GTS.

To potentially help others, I finally deduced that it is easy to tell the difference simply by looking at the backrest which is quite neat on the 36L and much wider and bigger-looking on the 42L (I think). I haven't got pics to prove the 42L backrest is bigger, but if anyone has one, it might be useful to reply with it

Thanks All